Chemical storage tank

ABSTRACT

A chemical storage tank includes at least a main body and two sealing members combined together with each other. The main body is formed as a cylinder or other shapes, integrally made of acid-proof and alkali-proof plastic materials, with a storage space formed inside it for storing any chemical material or product, and with a circumferential wall having its upper and its lower end respectively formed with a connecting opening. The sealing members are integrally made of the same plastic material of the main body, respectively combined together with the upper and the lower connecting opening of the main body by plastic welding. Thus, the welding portions between the main body and the sealing members are located around the circumferential wall, able to prevent pressure in the tank from damaging the chemical storage tank to insure safety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a chemical storage tank, particularly to one consisting of a main body and two sealing members integrally made of acid-proof and alkali-proof plastic materials respectively, leaving no weak portions possibly attacked by the pressure of the chemicals stored in it after having the main body welded together with the sealing members, ensuring the chemicals securely stored in it.

2. Description of the Prior Art

Commonly, a conventional chemical tank is so huge that it is uneasy to be integrally made of plastics. As shown in FIG. 1, a conventional chemical tank is always made of metal. But, the metal can only maximize its thickness to 10 mm as it is difficult to be properly bent with an arc with a thickness more than 10 mm. The conventional chemical storage tank is provided with a main body 1 and a sealing member 2.

The main body 1 is formed cylindrical, provided with an upper and a lower connecting opening 10 and 11 formed at its upper and its lower end.

The sealing member 2 is also made of metal, provided with plural metallic plates 20 welded together. As we know, a plate to be curved with an arc has to be gradually heated to get bent. Thus, for a chemical tank with a diameter and a height of several meters, it is obviously difficult to keep the plates 20 precisely heated to have a same curvature so as to be smoothly welded together. Moreover, a metallic plate is to degrade its properties after heated, lowering its resistance against acid and alkali, shortening its service life, and threatening security in use and even public safety.

As shown in FIG. 1, no matter how the sealing members 2 are welded or bent, a welding portion 12 between the main body 1 and the sealing members 2 is always welded with sharp edges, possible to lower its strength. The plates 20 are welded together to form plural welding lines 21 respectively positioned between every two adjacent plates 20. Positioned at the center of each of the sealing members 2 is a central welding portion 22 welded together with the welded plates 20.

As described previously, when the conventional chemical storage tank is filled with chemical material, the pressure generated by the chemical material is to directly attack the weakest portions of the tank, including the welding portions 12 between the main body 1 and the sealing members 2, defective welding lines 21 caused by an insufficient curvature of the plates 20, and the welding portions between the main body 1 and the sealing members 2. With the weak portions easy to be damaged by pressure of the stored chemical material, it is not only to damage the tank but to endanger public security.

SUMMARY OF THE INVENTION

One object of this invention is to offer a chemical storage tank having its main body and its sealing members integrally formed respectively. With two connecting openings of the main body respectively welded with a circumferential wall of the sealing members, welding lines are only positioned at the combining portion of the circumferential wall of the main body and those of the sealing members, able to sufficiently strengthen the structure of the storage tank for securely storing chemicals.

Another object of this invention is to offer a chemical storage tank having its main body and its sealing members integrally made of acid-proof and alkali-proof plastic material to prevent it from being attacked by chemicals with a high acid value or a high alkaline value.

The main characteristics of the invention are described below.

1. The chemical storage tank has its main body integrally made of acid-proof and alkali-proof plastic material in any shapes, provided with a storage space for storing chemical material or products.

2. The circumferential wall of the main body has its upper end and its lower end respectively formed with a connecting opening for being welded together with the sealing members.

3. The sealing members are integrally made of acid-proof and alkali-proof plastic materials.

4. Each of the sealing members is provided with a circumferential wall employed to combine with the connecting openings of the circumferential wall of the main body by plastic welding.

5. Each of the sealing members is provided with plural reinforcing ribs to strengthen its structure.

6. The sealing members have a thickness ranging between 10 mm and 45 mm.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a perspective and partial enlarged view of a conventional chemical storage tank;

FIG. 2 is an exploded perspective view of a preferred embodiment of a chemical storage tank in the present invention;

FIG. 3 is a cross-sectional view of the preferred embodiment of a chemical storage tank in the present invention; and

FIG. 4 is a perspective view of the preferred embodiment of a chemical storage tank in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As shown in FIGS. 2 and 3, a preferred embodiment of a chemical storage tank in the present invention includes a main body 3 and plural sealing members 4.

The main body 3 is formed cylindrical, made of acid-proof and alkali-proof plastics. Of course, the main body 3 can be as well shaped annular, elliptic or square. But, an annular one is preferable as it can homogeneously bear a higher pressure. The main body 3 is provided with a storing space 30 formed inside it for disposing chemical material or products, a circumferential wall 31, an upper and a lower connecting opening 32 respectively formed in an upper end and a lower end of the circumferential wall 31.

The sealing members 4 are integrally made of the same materials of the main body 3 so as to be compatibly welded together with it. The number of the sealing members 4 is equal to that of the connecting openings 32 formed in the upper end and the lower end of the circumferential wall 31 of the main body 3. Each of the sealing members 4 is provided with a circumferential wall 41, and a connecting opening 42 formed in one end of the circumferential wall 41 for matching with one of the connecting openings 32 of the main body 3 by plastic welding. And, as shown in FIGS. 3 and 4, the welding portions between the main body 3 and the sealing members 4 are all located around the circumferential wall of the storage tank, ensuring the whole storage tank to possess sufficient strength against pressure of a chemical stored in it, keeping the storage tank secure in use.

In addition, as shown in FIGS. 2 and 3 again, each of the sealing members 4 is provided with a linking portion 44 formed with an arc for jointing the circumferential wall 41 and a top portion 43. In stead of a sharp corner designed in the conventional one, the linking portion 44 is strong enough to withstand the pressure of a storing chemical.

Moreover, as shown in FIGS. 3 and 4, each of the sealing members 4 is also provided with a plurality of reinforcing ribs 45 positioned among the top portion 43 for strengthening the structure of the sealing members 4, so as to enable the storage tank to withstand more pressure, advancing security in service.

While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A chemical storage tank comprising: at least a main body integrally made of acid-proof and alkali-proof plastics and provided with a storage space formed inside it, a connecting opening formed in two ends of a circumferential wall of said main body; and at least two sealing members integrally made of acid-proof and alkali-proof plastics and respectively provided with a circumferential wall having a connecting opening formed in its two ends respectively, said connecting opening combined together with said connecting opening of said main body by plastic welding.
 2. The chemical storage tank as claimed in claim 1, wherein said main body and said sealing members are made of a same material.
 3. The chemical storage tank as claimed in claim 1, wherein each of said sealing members is provided with a linking portion formed with an arc for jointing its circumferential wall and its top portion.
 4. The chemical storage tank as claimed in claim 1, wherein each of said sealing members is provided with plural reinforcing ribs positioned spaced apart equidistantly in said top portion. 